Tool for cutting metal.



Patented ]uly 29, I902.

6. MGRORIE & D. J. HUNTER.

TOOL FOR CUTTING METAL.

(Application filed Feb. 27, 1902.)

(No Modei.)

G v 1 wm 3 m 7 a d y fw WE d w Jw m mineves' es i will be fed forward ateach revolution.

UNITED STATES PATENT OFFICE.

COLIN MORORIE AND DANIEL JEFFERSON HUNTER, OF COUNTY OF SURREY,

' ENGLAND.

TOOL FOR CUTTING METAL.

SPECIFICATION forming part of Letters Patent No. 705,695, dated July29,1902.

Application filed February 27, Serial lilo. 96,001. (No model.)

This invention relates to improvements in tools for cuttingcylindricallengths of metal, such tools being especially applicabletocut-j ting blanks in which extreme accuracy is required, such as formicrometer-screw blanks. According to this invention each cutter is asegment of a metalring, (a small segment only having been cut away fromthe ring,) the front or working end of which has an outer surface lyingin a plane at right angles to the axis of the cutter. A portion of oneof the radial edges of the segment nearest to the central hole forms acutting edge. radial edge is-not in the same plane with it; but the faceof the disk is recessed, the recess slowly deepening, so that the bottomof the recess forms a slow spiral. The extent of this recess determinesthe amount the werk he cutter is clamped and held fast in the interiorof a tubular holder. One end of the tube which forms the holder has aninwardly-projecting flange. thread out upon it. A portion of the side ofthe tube is cut away to allow the shavings cut off by the cutter orcutters to pass away. A small flanged ring is placed within the flangedend of the tubularholder, the flange on the ring bearing against theinner face of the flange of the holder. The hole through this small ringis of the same diameter as the end ofthe metal rod which is to be shapedand serves to hold it concentric with the tubular holder. Next to thesmall ring is placed a cutter. By exchanging one sized cutter foranother or bythe use of agreater or less number ofdistance-pieces metalrods of difierent diameters or lengths or cut with asquare or roundshoulder may be made, the change being effected with great ease In orderthat our invention may be better understood and readily carried intoeffect we The other- The other end has a screwwill describe it withreference to the accompanying drawings.

Figure l is a side elevation; Fig. 2, a side elevation, partly insection, and Fig. 3 a section of the tool, and Fig. 4c a face View ofthe same. Fig. 5 is the blank formed by the combination of cutters shownin Fig. 3. Fig. 6 is a front section. showing the cutter D, taken on theline AA of Fig. 3. Fig. 7 isa front view, Fig. 8 a side view, and Fig. 9a section of the same shown to a larger scale. Fig. l0is a section onthe lineB B of Fig. 2. Fig. 11 is a perspective view, Fig. 12 a plan andside elevations, taken at right angles to each other, of the cutter G ofFig. 3. Fig. 13 is a front elevation, Fig. 14. a side elevation, Fig. 15a section, and Fig. 16 a perspective View, of a modified form of cutter.

In the drawings, A is the tubular holder;

.13, the inwardly-projecting flange on the front end of the same. isscrew-threaded.

The rear end of the holder If it be required to make a blank shaped asshown in Fig. 5, a flanged ring 0 is first pushed through the open endof the holder, then a cutter D, a distancepiece E, a second cutter F, acutter G for cut- .ting the point of the blank, and a plug H, and

the whole screwed tight by the screw-plug I. The details of the cutterswill be described later.

.Thetool-holder is held fast in the slide-rest of a lathe while themetal rod to be shaped is rotated, the feed being governed by the spiralrecess of the foremost cutter.

. It will readily be seen that by the use of more distance-pieces E orcutters and distance-pieces having a larger or smaller bore for thepassage of the work, or even the use alone of an end cutter G, a greatvariety of work can be produced, the cutters being removed and replacedby others with'ver'y great ease.

The cutter D consists of a segment having, as shown, a central hole forthe passage of the work, the front or working end ofthe segment havingan outer surface lying in a plane at right angles to the axis of thecutter. The portion (1 of the radial edge is the cutting edge. The otheredge d is not in the same plane with it, but the face of the disk isrecessed, the recess slowly deepening from dto d, so that the bottom ofthe recess forms a slow spiral. The extent of the recess at 01 may forfine work be one one-hundredth of an inch. The recess determines thefeed at each revolution. A cutter such as shown will cut asquare-shouldered rod. The second cutter F is similar to the above, butthe bore for the passage of the work is smaller, and therefore a steppedblank is produced.

The distance-piece E is a segment of a disk and is shown in Fig. 10.

The cutter G for forming the end is shown in perspective to a largerscale in Fig. 11 and in plan and side elevations taken at right an glesto each other in Fig. 12.

g is the cutting edge.

If a conical shoulder be desired, cutters such as shown to a largerscale in Figs. 13, 14, 15, and 16 are used.

The cutting-face ais hollowed out at a to the shape it is intended toform the shoulder. The face is, as before, provided with a spiralrecess, (shown most clearly in Fig. 15,) in which a shows the plane ofthe cutting edge and a the bottom of the recess.

What we claim is 1. A cutter for cutting cylindrical lengths consistingof a segment of a metal ring, the front or Working end of which has anouter surface lying in a plane at right angles to the axis of thecutter, and having also a curved recess the inner surface of whichgradually deepens as it extends around the axis, the inner portion ofone of the radial edges of the segment forming the cutting edge, whilethe similar inner portion of the other radial edge is at the inner endof the gradually-deepening recess in rear of the cutting edge.

2. The combination of a cutter for cutting cylindrical lengths of metalconsisting of a segment of a metal ring the inner portion of one of theradial edges forming the cutting edge while the similar inner portion ofthe other radial edge is not inthe same plane with it agradually-deepening recess being formed in the face of the segment witha tubular holder one end of which has an inwardly-projecting flange andin which a portion of the side is cut away and means for holding thecutter stationary within the tubular holder.

3. The combination of two or more cutters for cutting cylindricallengths of metal each consisting of a segment of a metal ring the innerportion of one of the radial edges forming the cutting edge while thesimilar inner portion of the other radial edge is not in the same planewith it a gradually-deepening recess being formed in the face of thesegment, and a distance-piece inserted between said cutters, with atubular holder one end of which has an inwardly-projecting flange and inwhich a portion of the side is cut away and means for holding thecutters stationary within the tubular holder.

4. The combination of a cutter for cutting cylindrical lengths of metalconsisting of a segment of a metal ring the inner portion of one of theradial edges forming the cutting edge while the, similar inner portionof the other radial edge is not in the same plane with it agradually-deepening recess being formed in the face of the segment, anda on tter for pointing the end of the metal length, with a tubularholder one end of which has an inwardly-projecting flange and in which aportion of the side is cut away and means for holding the cuttersstationary within the tubular holder.

5. The combination of two or more cutters for cutting cylindricallengths of metal each consisting of a segment of a metal ring the innerportion of one of the'radial edges forming the cutting edge while thesimilar inner portion of the other radial edge is not in the same planewith it a gradually-deepening recess being formed in the face of thesegment, a distance-piece inserted between said cutters, and a cutterfor pointing the end of the metal length, with a tubular holder one endof which has an inwardly-projecting flange and in which a portion of theside is cut away and means for holding the cutters stationary within thetubular holder.

COLIN MCRORIE. DANIEL JEFFERSON HUNTER.

Witnesses:

JOHN H. WHITEHEAD, FREDK. C. WVEATHERLY.

